\begin{tabular} 
\multicolumn{8}{c}{\textbf{group 1}} \\
\midrule
\multirow{6}{*}{\textbf{design1}}
&pos1&15.05&1.06&0.145&-3.41&-0.28&0.610\\
&pos2&9.20&0.65&0.258&-4.02&-0.32&0.627\\
&pos3&32.92&2.30&0.011&4.87&0.40&0.344\\
&pos4&6.46&0.69&0.247&3.94&0.45&0.327\\
&pos5&10.99&0.87&0.191&0.41&0.03&0.486\\
&pos6&36.70&2.20&0.014&30.20&1.94&0.026\\
\end{tabular}
